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Shark's eye
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Similar to that of vertebrates, the shark's eye is composed of a crystalline lens, a cornea, a retina and an expandable and contractable pupil, unlike that of rayfish. Its eyelid does not blink and it is permanently cleaned by the ambient water. Behind its retina, its choroidal tapetum reflects the light and improves its aquatic vision in dark waters. The shark can furthermore pass at any time from a monocular to a stereoscopic vision.
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